PropertyCallbackInfo< T > Class Template Reference

#include <v8-function-callback.h>

Public Member Functions
V8_INLINE Isolate *	GetIsolate () const
V8_INLINE Local< Value >	Data () const
V8_INLINE Local< Object >	This () const
	V8_DEPRECATED ("V8 will stop providing access to hidden prototype (i.e. " "JSGlobalObject). Use HolderV2() instead. \n" "DO NOT try to workaround this by accessing JSGlobalObject via " "v8::Object::GetPrototype() - it'll be deprecated soon too. \n" "See http://crbug.com/333672197. ") V8_INLINE Local< Object > Holder() const
V8_INLINE Local< Object >	HolderV2 () const
V8_INLINE ReturnValue< T >	GetReturnValue () const
V8_INLINE bool	ShouldThrowOnError () const

Friends
template<typename U >
class	PropertyCallbackInfo
class	MacroAssembler
class	internal::PropertyCallbackArguments
class	internal::CustomArguments< PropertyCallbackInfo >
void	internal::PrintPropertyCallbackInfo (void *)

Detailed Description

template<typename T>
class v8::PropertyCallbackInfo< T >

The information passed to a property callback about the context of the property access.

Definition at line 187 of file v8-function-callback.h.

Member Function Documentation

Data()

template<typename T >

Local< Value > Data

(

)

const

Returns

The data set in the configuration, i.e., in NamedPropertyHandlerConfiguration or IndexedPropertyHandlerConfiguration.

Definition at line 670 of file v8-function-callback.h.

GetIsolate()

template<typename T >

Isolate * GetIsolate

(

)

const

Returns

The isolate of the property access.

Definition at line 665 of file v8-function-callback.h.

Referenced by PropertyCallbackInfo< T >::ShouldThrowOnError().

GetReturnValue()

template<typename T >

ReturnValue< T > GetReturnValue

(

)

const

Returns

The return value of the callback. Can be changed by calling Set().

info.GetReturnValue().Set(...)

Definition at line 702 of file v8-function-callback.h.

HolderV2()

template<typename T >

Local< Object > HolderV2

(

)

const

Returns

The object in the prototype chain of the receiver that has the interceptor. Suppose you have x and its prototype is y, and y has an interceptor. Then info.This() is x and info.Holder() is y. In case the property is installed on the global object the Holder() would return the global proxy.

Definition at line 692 of file v8-function-callback.h.

References Internals::HasHeapObjectTag().

ShouldThrowOnError()

template<typename T >

bool ShouldThrowOnError

(

)

const

Returns

True if the intercepted function should throw if an error occurs. Usually, true corresponds to ‘'use strict’`.

Note

Always false when intercepting Reflect.set() independent of the language mode.

Definition at line 707 of file v8-function-callback.h.

References PropertyCallbackInfo< T >::GetIsolate(), Internals::kDontThrow, Internals::kInferShouldThrowMode, and v8::internal::ShouldThrowOnError().

This()

template<typename T >

Local< Object > This

(

)

const

Returns

The receiver. In many cases, this is the object on which the property access was intercepted. When using Reflect.get, Function.prototype.call, or similar functions, it is the object passed in as receiver or thisArg.

void GetterCallback(Local<Name> name,
                    const v8::PropertyCallbackInfo<v8::Value>& info) {
   auto context = info.GetIsolate()->GetCurrentContext();
 
   v8::Local<v8::Value> a_this =
       info.This()
           ->GetRealNamedProperty(context, v8_str("a"))
           .ToLocalChecked();
   v8::Local<v8::Value> a_holder =
       info.Holder()
           ->GetRealNamedProperty(context, v8_str("a"))
           .ToLocalChecked();
 
  CHECK(v8_str("r")->Equals(context, a_this).FromJust());
  CHECK(v8_str("obj")->Equals(context, a_holder).FromJust());
 
  info.GetReturnValue().Set(name);
}
 
v8::Local<v8::FunctionTemplate> templ =
v8::FunctionTemplate::New(isolate);
templ->InstanceTemplate()->SetHandler(
    v8::NamedPropertyHandlerConfiguration(GetterCallback));
LocalContext env;
env->Global()
    ->Set(env.local(), v8_str("obj"), templ->GetFunction(env.local())
                                         .ToLocalChecked()
                                         ->NewInstance(env.local())
                                         .ToLocalChecked())
    .FromJust();
 
CompileRun("obj.a = 'obj'; var r = {a: 'r'}; Reflect.get(obj, 'x', r)");

Definition at line 675 of file v8-function-callback.h.

V8_DEPRECATED()

template<typename T >

V8_DEPRECATED

(

"V8 will stop providing access to hidden prototype (i.e. " "JSGlobalObject). Use HolderV2() instead. \n" "DO NOT try to workaround this by accessing JSGlobalObject via " "v8::Object::GetPrototype() - it'll be deprecated soon too. \n" "See http://crbug.com/333672197. "

)

const

Returns

The object in the prototype chain of the receiver that has the interceptor. Suppose you have x and its prototype is y, and y has an interceptor. Then info.This() is x and info.Holder() is y. The Holder() could be a hidden object (the global object, rather than the global proxy).

Note

For security reasons, do not pass the object back into the runtime.

Friends And Related Symbol Documentation

internal::CustomArguments< PropertyCallbackInfo >

template<typename T >

friend class internal::CustomArguments< PropertyCallbackInfo >

friend

Definition at line 293 of file v8-function-callback.h.

internal::PrintPropertyCallbackInfo

template<typename T >

void internal::PrintPropertyCallbackInfo ( void *  )

friend

internal::PropertyCallbackArguments

template<typename T >

friend class internal::PropertyCallbackArguments

friend

Definition at line 293 of file v8-function-callback.h.

MacroAssembler

template<typename T >

friend class MacroAssembler

friend

Definition at line 292 of file v8-function-callback.h.

PropertyCallbackInfo

template<typename T >

template<typename U >

friend class PropertyCallbackInfo

friend

Definition at line 291 of file v8-function-callback.h.

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The documentation for this class was generated from the following file:

• include/v8-function-callback.h